1978 Rolex GMT-Master (Ref. 1675) Mk. II Dial "Blueberry"

Within the vintage Rolex collecting community, the all-blue “Blueberry” bezel insert has become a well-known variation associated with the GMT-Master reference 1675. While period Rolex catalogs and advertising materials do not document a factory configuration pairing the reference with an all-blue bezel, many collectors believe these inserts originated through Rolex service channels rather than standard production.

Examples began appearing within the collecting market in the early 2000s, reportedly sourced from an official Rolex service center. Because of this, many seasoned collectors view the Blueberry insert as a period Rolex service component produced during the lifespan of the GMT-Master rather than a bezel fitted to watches when originally delivered from the factory. The deep blue tone of the insert offers a distinctive alternative to the more commonly seen red and blue “Pepsi” or all-black bezel configurations and has become a recognizable aesthetic within the broader GMT-Master collecting landscape. Interestingly, the "Blueberry" inserts do possess key font and manufacturing characteristics seen in other period inserts, such as serrifs on the font 

Today, the Blueberry insert represents one of the many fascinating variations that emerged during the decades-long production of the GMT-Master. For collectors who appreciate the nuances of vintage Rolex components and the subtle evolution of the model over time, it remains a compelling and visually striking configuration.